The file '“Maximum Style” Roof Vent For Enclosures 3D Printer Model' is (stl) file type, size is 2.1MB.
This is a convection based "roof vent" based on the "Maximum" brand style.
I used it to ensure the sand would dry in the sandbox even though the cover is on. I suppose it can be used on any horizontal roof of enclosed spaces. To put on a sloped roof (classic dog house for example) it would need a custom adapter.
It is made for a hole diameter of 54 mm (~2 1/8 in.) and comes with a nut. Should you want to prevent insects getting in through, you can a glue a patch of window screen on the underside of the nut. The nut is not necessary for fixation if you use caulking, but it does add some strength to the assembly.
roof-vent-nut.stl | 2.8MB | |
roof-vent.stl | 2.1MB |